Hanna Instruments HI 88703 - Manual (Page 21)

21
CALIBRATION PROCEDURE FOR RATIO /
NON RATIO TURBIDITY RANGE
HI 88703 has a powerful calibration function that compensates for lamp aging or changing. The
calibration can be done using the suplied calibration solutions or user prepared standards.
HI 88703 turbidimeter is supplied with 5 AMCO standards: <0.1 NTU, 15 NTU, 100, 750 NTU
and 2000 NTU. The Hanna standards are specially designed for this instrument. Turbidity standards
have a shelf life and should not be used after the expiration date. Alternatively, formazin standards
can be used. It is recommended that the turbidity value of the prepared calibration solutions to be
close to the default calibration points.
The first calibration point should be near 0 NTU, the second point can be chosen between 10 and
20 NTU, the third point between 50 and 150 NTU, the fourth point between 600 and 900 NTU and
the fifth point between 1500 and 2500 NTU.
U T N ts e r a e N o t d n u o R
0 . 1 - 0 . 0 5 0 . 0
0 1 - 1 1 . 0
0 4 - 0 1 1
0 0 1 - 0 4 5
0 0 4 - 0 0 1 0 1
0 0 0 1 - 0 0 4 0 5
0 0 0 1 > 0 0 1
EPA MODE
To round the readings as EPA specifications press
the
EPA key. The “EPA” text is displayed on the
left side of the LCD and the reading is rounded as
follows: